If you gave me only one word to describe The Polyphonic Spree, I think it'd have to be orchestral.
The Wikipedia page for The Polyphonic Spree (formed in 2000 in Texas) lists TWENTY members as part of the current lineup, and another FIFTY as former members (most notably, Annie Clark, known now as St. Vincent began her career as a touring member of the band). It's a wild combination of vocals, bells, strings, horns, percussion, keys, and more... and, usually, I actually think it sounds pretty good. If nothing else, it's entertaining: their first two albums contained ten songs each, with each of the songs being named "Section 1," "Section 2," et. cetera, all the way up to 20. They then abandoned that theme for a while (I can't imagine why), only to return to it in 2007, which saw them release another album along the same theme. The final track was titled "Section 32." Odd, odd, people.
They're also notable for being responsible for the soundtrack of Eternal Sunshine of the Spotless Mind, which I know @paulisaverage will appreciate.
Here they are covering "Heart of Gold," an all-time great Neil Young song. I'm surprised with how OK I am with the job they do. In fact, I think it sounds great. And it's fun to watch - the bald bassist standing on the chair in the back is something of a cherry on top.